1. McMaster University; Department of Internal Medicine; 1280 Main Street West CRL - 140 Hamilton Ontario Canada L8S 4K1
2. University of Sheffield; Academic Unit of Haematology; H Floor Royal Hallamshire Hospital Sheffield UK S10 2JF
3. Cochrane Central Executive; Review Production and Quality Unit, Editorial & Methods Department; St Albans House, 57-59 Haymarket London UK SW1Y 4QX
4. University of Modena and Reggio Emilia; Cochrane Italy, Department of Diagnostic, Clinical and Public Health Medicine; Via del Pozzo 71 Modena Italy 41124
5. McMaster University; Department of Health Research Methods, Evidence and Impact (HEI); 1280 Main Street West CRL - 140 Hamilton ON Canada L8S 4K1